Auto reply and loop-back method for the remote measurement of the quality of an internet phone

A method of automatic response and loopback for remotely measuring the quality of Internet telephone, the method comprising in steps of:

• (A) receiving a request call from a measuring instrument (290) by first IP phone (200a) to measure the quality (S310), and analyzing the received call to check whether the received call is the call for remotely measuring the quality (S320);
• (A1) deactivating when the received call is a call for remote quality measurement after checking in the step A, by the first IP phone (200a), a sound generator (211), which notifies call reception, and a caller number display (213), which displays a caller number associated with a received call (S330);
• (A2) deactivating when the received call is a call for remote quality measurement after checking in the step A, by the first IP phone (200a), a voice activity detector (207), which transmits silence packets, and an echo remover (209), which detects and removes echo in a voice signal, so as to successfully loop back data for the call received from the measurement instrument (290) to the measurement instrument (290) (S340);
• (B) responding the request call for measuring the quality by the first IP phone (200a), and sending a connection signal with a loopback indication and a loopback mode indication without sound signal (S350);
• (C) sending an RTP packet to the first IP phone (200a) by the measuring instrument (290) (S360), and checking whether a loopback mode is set by the first IP phone (200a) during the call reception for remotely measuring the quality and transmitting the connection signal to the IP packet loopback or media loopback (S370);
• (D) sending immediately when the loopback mode is IP packet loopback between a jitter buffer (201) and an IP network (270), by the first IP phone (200a), a loopback RTP packet which header is a newly created RTP header and payload is a copy of the payload of the received RTP packet to the measuring instrument (290) (S373);
• (D1) sending when the loopback mode is media loopback between an encoder/decoder (203) and a POTS network (205) after checking in the step C, by the first IP hone 200a a loopback RTP racket whose header is a newly created RTP header and whose payload is a copy of the decoded payload of the received RTP packet after passing through the encoder/decoder (203) to the measurement instrument (290) (S375);
• and
• (E) terminating when a regular call is received or placed during the handling of the call for quality measuring by the first IP phone (200a), the call for quality measuring and processing the regular call first (S380).